Mosaic director settles RSUs, gets new grant

WESTBROOK KELVIN R reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

WESTBROOK KELVIN R reported acquisition or exercise transactions in this Form 4 filing.

Mosaic Co director Kelvin R. Westbrook reported compensation-related equity activity. He received 2,437 shares of common stock upon vesting of 4,873 restricted stock units, electing to take the remaining 50% of that award in cash. Following this, he directly holds 39,807 Mosaic shares. Westbrook was also granted a new award of 7,273 restricted stock units, which will vest and be paid on the date of Mosaic’s 2027 Annual Meeting of Stockholders.

Insights

Equity compensation analyst

Routine RSU vesting and new grant, with no open‑market trading.

Director Kelvin R. Westbrook settled 4,873 restricted stock units, receiving 2,437 Mosaic common shares and electing to take the remaining half in cash, as allowed under the Restricted Stock Unit Agreement. This is a standard equity compensation event, not a market purchase or sale.

He also received a new grant of 7,273 restricted stock units that will vest at the issuer’s 2027 Annual Meeting of Stockholders. After these transactions, he directly holds 39,807 common shares and 7,273 RSUs. With no open‑market trades or disposals reported, the filing mainly updates Westbrook’s equity-based compensation position.

Insider Trade Summary

4,873 shares exercised/converted

Exercise 3 txns

Insider WESTBROOK KELVIN R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Units	7,273	$0.00	$0.00
Exercise	Restricted Stock Units	4,873	$0.00	$0.00
Exercise	Common Stock	2,437	$0.00	$0.00

Holdings After Transaction: Restricted Stock Units — 7,273 contracts (Direct); Common Stock — 39,807 shares (Direct)

Footnotes (5)

1. F1. The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made, elected to receive 50% of the restricted stock units in the form of cash with the balance paid in the form of shares of common stock at the time the award was paid.
2. F2. One-for-One
3. F3. The restricted stock units will vest and be paid to the reporting person on the date of the issuer's 2027 Annual Meeting of Stockholders.
4. F4. Not Applicable
5. F5. The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders.

Key Figures

Shares received from vested RSUs: 2,437 shares RSUs vested: 4,873 units New RSU grant: 7,273 units +2 more

5 metrics

Shares received from vested RSUs 2,437 shares Common stock delivered from 4,873 vested RSUs on May 28, 2026

RSUs vested 4,873 units Restricted stock units vested at 2026 Annual Meeting of Stockholders

New RSU grant 7,273 units Award vesting and payable at 2027 Annual Meeting of Stockholders

Shares held after transactions 39,807 shares Direct Mosaic common stock holdings following May 28, 2026 events

RSUs outstanding after grant 7,273 units Unvested restricted stock units held directly after reported grant

Key Terms

Restricted Stock Units, Restricted Stock Unit Agreement, vested, Annual Meeting of Stockholders

4 terms

Restricted Stock Units financial

"The reporting person elected to receive 50% of the restricted stock units in the form of cash"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Restricted Stock Unit Agreement financial

"pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made"

A restricted stock unit agreement is a written contract between a company and an individual that describes a promise to deliver company shares or cash later, subject to conditions such as time-based vesting or performance targets. Think of it like a timed gift: the recipient only receives the shares if they meet the agreed conditions. Investors care because these agreements create future share issuance, affect potential dilution, corporate expenses and incentives for insiders, and influence when insiders may sell shares.

vested financial

"The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders."

Annual Meeting of Stockholders financial

"will vest and be paid to the reporting person on the date of the issuer's 2027 Annual Meeting of Stockholders."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Mosaic (MOS) director Kelvin Westbrook report in this Form 4?

Kelvin Westbrook reported settlement of vested restricted stock units and receipt of a new RSU grant. He received 2,437 Mosaic common shares from 4,873 vested RSUs and was awarded 7,273 new RSUs vesting at the 2027 annual meeting, with no open-market trades.

How many Mosaic shares does Kelvin Westbrook hold after these transactions?

After the reported transactions, Kelvin Westbrook directly holds 39,807 shares of Mosaic common stock. This reflects shares received from vested restricted stock units on May 28, 2026, combined with his prior holdings, and does not include his new 7,273-unit RSU award, which remains unvested.

What happened to Kelvin Westbrook’s 4,873 vested Mosaic restricted stock units?

The 4,873 restricted stock units vested on the date of Mosaic’s 2026 Annual Meeting of Stockholders. Under the award terms, Westbrook elected to receive 50% in cash and the remaining 2,437 units in Mosaic common shares, which increased his direct share holdings.

What are the terms of Kelvin Westbrook’s new Mosaic RSU grant?

Westbrook received a new grant of 7,273 restricted stock units linked one-for-one to Mosaic common shares. These RSUs will vest and be paid on the date of Mosaic’s 2027 Annual Meeting of Stockholders, representing additional deferred equity compensation rather than an immediate share issuance.

Does this Mosaic (MOS) Form 4 show any open-market stock purchases or sales?

No, the Form 4 shows no open-market purchases or sales of Mosaic stock. All reported activity involves settlement of previously granted restricted stock units and a new RSU award, which are compensation-related events rather than discretionary market trading in the company’s shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/01/2026 - 07:23 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

WESTBROOK KELVIN R

(Last) (First) (Middle)

C/O THE MOSAIC COMPANY

101 EAST KENNEDY BLVD., SUITE 2500

(Street)

TAMPA FLORIDA 33602

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MOSAIC CO [ MOS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/28/2026		M		2,437(1)	A	$0	39,807	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(2)	05/28/2026		A		7,273		(3)	(4)	Common Stock	7,273	$0	7,273	D
Restricted Stock Units	(2)	05/28/2026		M			4,873(1)	(5)	(4)	Common Stock	4,873	$0	0	D

Explanation of Responses:

1. The reporting person, pursuant to the terms of the Restricted Stock Unit Agreement under which the award of restricted stock units was made, elected to receive 50% of the restricted stock units in the form of cash with the balance paid in the form of shares of common stock at the time the award was paid.

2. One-for-One

3. The restricted stock units will vest and be paid to the reporting person on the date of the issuer's 2027 Annual Meeting of Stockholders.

4. Not Applicable

5. The restricted stock units vested on the date of the issuer's 2026 Annual Meeting of Stockholders.

Remarks:

	/s/ Philip E. Bauer, Attorney-in-Fact for Kelvin R. Westbrook	06/01/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)